Index: Mk/Uses/go.mk
===================================================================
--- Mk/Uses/go.mk
+++ Mk/Uses/go.mk
@@ -126,4 +126,17 @@
 .endfor
 .endif
 
+# Helper targets for port maintainers
+
+.if ${go_ARGS:Mmodules}
+_MODULES2TUPLE_CMD=	modules2tuple
+gomod-vendor: patch
+	@if type ${_MODULES2TUPLE_CMD} > /dev/null 2>&1; then \
+		cd ${WRKSRC}; ${GO_CMD} mod vendor; \
+		[ -r vendor/modules.txt ] && ${_MODULES2TUPLE_CMD} vendor/modules.txt; \
+	else \
+		${ECHO_MSG} "===> ${_MODULES2TUPLE_CMD} not found. Please install \"modules2tuple\" package or \"ports-mgmt/modules2tuple\" port."; \
+	fi
+.endif
+
 .endif # defined(_POSTMKINCLUDED) && !defined(_INCLUDE_USES_GO_POST_MK)